Characteristic: Includes 16mm, 18.5mm, 20mm, 25mm, and 30mm drill bits, designed to meet professional requirements. Made of solid high-speed steel, offering durability, high hardness, fast cutting speed, impact resistance, wear resistance, and high-temperature resistance. Features sharp cutting edges and anti-slip design for reduced power consumption and extended service life. Suitable for drilling thick steel plates, cast iron, stainless steel, non-standard angle iron, and other metal materials. Ideal for installing locks and knobs on doors and cabinets, or creating holes through desktops. Compatible with handheld electric drills, vertical electric drills, and magnetic base drills. Efficient and precise cutting performance on stainless steel, metal sheets, cast iron, mild steel, aluminum, plastic, copper, and brass.Description: Name: Drill Hole Opener Set Material: High-Speed Steel Color: Silver + Gold Package Contents: 1 x Drill Hole Opener Set Note: The package includes only the items listed above; other accessories are not included. Due to lighting effects and monitor settings, the actual color of the item may vary slightly from the image. Measurement may vary by up to +/- 1-3 cm.